WO2017143858A1 - 一种动态背光调节方法及装置 - Google Patents

一种动态背光调节方法及装置 Download PDF

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Publication number
WO2017143858A1
WO2017143858A1 PCT/CN2016/113071 CN2016113071W WO2017143858A1 WO 2017143858 A1 WO2017143858 A1 WO 2017143858A1 CN 2016113071 W CN2016113071 W CN 2016113071W WO 2017143858 A1 WO2017143858 A1 WO 2017143858A1
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Prior art keywords
backlight value
display device
last
period
determination period
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PCT/CN2016/113071
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English (en)
French (fr)
Inventor
姚方谋
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广州视源电子科技股份有限公司
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Publication of WO2017143858A1 publication Critical patent/WO2017143858A1/zh

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406—Control of illumination source
    • G09G3/3413—Details of control of colour illumination sources
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/066—Adjustment of display parameters for control of contrast

Definitions

  • the present invention relates to the field of liquid crystal display devices, and in particular, to a dynamic backlight adjustment method and a dynamic backlight adjustment device.
  • the existing liquid crystal display devices mostly adopt dynamic backlight adjustment technology to achieve energy saving purposes.
  • the conventional dynamic backlight adjustment method generally acquires the backlight value of the display device according to the mapping relationship between the brightness of the display screen and the backlight value of the display device, and directly writes a corresponding backlight value to the display device to perform backlight adjustment.
  • the method has the following disadvantages: obtaining the backlight value of the display device according to the mapping relationship, and directly writing the backlight value to the display device, causing the backlight adjustment process to be fast and unstable, causing the display screen to flicker, thereby causing the display device to output the flash animation surface.
  • the display of the display is poor.
  • an object of the present invention is to provide a dynamic backlight adjustment method and apparatus, which can slowly and stably adjust the backlight value of the display device to prevent the display device from flickering due to the backlight value changing too fast. It is also possible to prevent the backlight adjustment of the display device from being disturbed by the fluctuation of the input display signal and affecting the display effect of the display screen.
  • the present invention provides a dynamic backlight adjustment method, including the following steps:
  • each of the determining periods includes N reading periods, N ⁇ 2;
  • the target backlight value according to the current judgment period is Calculating the final backlight value by the target backlight value of the last judgment period
  • the backlight value of the display device is adjusted according to the final backlight value obtained each time.
  • the display screen state of the display device is determined according to the last judgment period, and the target backlight value of the display device is assigned at the current judgment period, specifically:
  • the target backlight value is assigned a preset maximum brightness value
  • the target backlight value is assigned to the average value of the brightness of all the display screens read in the previous determination cycle.
  • the final backlight value is calculated according to the target backlight value of the current determination period and the target backlight value of the last determination period:
  • the amount of change of the final backlight value obtained each time is 1/N of the difference between the target backlight value of the current determination period and the target backlight value of the last determination period.
  • the calculation formula of calculating the final backlight value according to the target backlight value of the current determination period and the target backlight value of the last determination period is:
  • VAL BL [BL last +(BL current -BL last ) ⁇ n/N)] ⁇ Q
  • VAL BL represents the final backlight value
  • BL last represents the target backlight value of the last judgment period
  • BL current represents the target backlight value of the current judgment period
  • n represents that the nth read cycle is read during the current judgment period
  • the display screen brightness 1 ⁇ n ⁇ N
  • Q represents the user adjustment coefficient, 0 ⁇ Q ⁇ 1.
  • the method further includes the following steps:
  • SUM abs represents the absolute difference sum
  • SUM represents the relative difference sum
  • B i and B i-1 respectively represent the current reading time read in the 2nd to Nth read cycles Displays the brightness of the screen and the brightness of the display screen read at the last reading time.
  • the method further includes the steps of:
  • the corresponding absolute difference sum is smaller than Or equal to the first preset error threshold and the corresponding relative difference sum is less than or equal to the preset error threshold, determining that the display screen of the display device in the corresponding judgment period is a static screen; otherwise, determining that the corresponding The display screen of the display device is the active screen; the first preset error threshold is calculated by the formula (N-1) ⁇ GAP, wherein the GAP is the preset error threshold.
  • the display screen state of the display device according to the last judgment period, after the current judgment period starts to assign the target backlight value of the display device further includes the steps of:
  • the target backlight value of the current judging period of the display device and the target backlight value of the last judging period are assigned, specifically:
  • the target backlight value of the current determination period and the target backlight value of the last determination period are all assigned to a preset maximum target backlight value.
  • the invention also provides a dynamic backlight adjustment device, comprising:
  • a first assignment module configured to display a display screen state of the device according to a previous determination period, and assign a target backlight value to the display device at a current determination period;
  • a reading module configured to read a display screen brightness of the display device according to a preset reading period; wherein each of the determining periods includes N reading periods, N ⁇ 2;
  • a first calculating module configured to: according to a current judgment period after reading the brightness of the display screen each time Calculating the final backlight value by the target backlight value and the target backlight value of the last determination period;
  • an adjustment module configured to adjust a backlight value of the display device according to the final backlight value obtained each time.
  • the first evaluation module specifically includes:
  • a first assignment unit configured to: if the display screen of the display device of the last judgment period is a static screen, the target backlight value is assigned a preset maximum brightness value;
  • the second evaluation unit is configured to: if the display screen of the display device of the last judgment period is a moving screen, the target backlight value is assigned to an average value of brightness of all display screens read in the previous determination period.
  • the first calculating module satisfies: the amount of change of the final backlight value calculated each time is the difference between the target backlight value of the current determination period and the target backlight value of the last determination period. 1/N of the value.
  • the calculation formula of calculating the final backlight value according to the target backlight value of the current determination period and the target backlight value of the last determination period is:
  • VAL BL [BL last +(BL current -BL last ) ⁇ n/N)] ⁇ Q
  • VAL BL represents the final backlight value
  • BL last represents the target backlight value of the last judgment period
  • BL current represents the target backlight value of the current judgment period
  • n represents that the nth read cycle is read during the current judgment period
  • the display screen brightness 1 ⁇ n ⁇ N
  • Q represents the user adjustment coefficient, 0 ⁇ Q ⁇ 1.
  • the dynamic backlight adjustment device further includes:
  • SUM abs represents the absolute difference sum
  • SUM represents the relative difference sum
  • B i and B i-1 respectively represent the current reading time read in the 2nd to Nth read cycles Display screen brightness, display screen brightness read at the last reading time;
  • a judging module configured to: at the end of each of the judging periods, display a display screen state of the device according to the corresponding absolute difference sum and the relative difference sum and the corresponding judgment period, wherein, if the corresponding If the absolute difference is less than or equal to the first preset error threshold and the corresponding relative difference is less than or equal to the preset error threshold, it is determined that the display screen of the display device is a static picture in the corresponding determination period; otherwise And determining that the display screen of the display device is the active screen in the corresponding judgment period; the first preset error threshold is calculated by using a formula (N-1) ⁇ GAP, wherein the GAP is the preset error threshold.
  • the dynamic backlight adjustment device further includes:
  • the second evaluation module is configured to assign the target backlight value of the current determination period to the preset minimum backlight value if the target backlight value of the current determination period is less than a preset minimum backlight value.
  • the dynamic backlight adjustment device further includes:
  • the preset module is configured to assign a target backlight value of the current judgment period of the display device and a target backlight value of the last judgment period before the start of the first determining period, specifically:
  • the invention provides a dynamic backlight adjustment method and a dynamic backlight adjustment device.
  • the target backlight value of the display device is assigned at the current determination period, and then according to each read cycle.
  • the final backlight value changes linearly, and the final backlight value of the display device is periodically adjusted.
  • the final backlight value is gradually increased or decreased from the target backlight value of the last judgment period until the target backlight value of the current judgment period is approached, so that the backlight adjustment process for the display device is slow and stable, thereby effectively preventing the display.
  • the backlight value of the device changes too fast and the display flickers.
  • the target backlight value of the display device is assigned at the beginning of the current judgment period
  • the backlight value of the display device is not directly adjusted by the target backlight value during the backlight adjustment process, but is gradually changed within the current judgment period.
  • Way to make the final backlight of the display device The value gradually approaches the target backlight value from the target backlight value of the last judgment period, which can effectively prevent the display device from affecting the display effect of the display screen due to the interference of the input display signal fluctuation during the backlight adjustment process.
  • Embodiment 1 is a schematic flow chart of a dynamic backlight adjustment method according to Embodiment 1 of the present invention.
  • FIG. 2 is a schematic diagram showing the refinement process of assigning the target backlight value of the display device to the current determination period according to the state of the display screen of the display device in the first determination cycle according to the first embodiment of the present invention.
  • Embodiment 3 is a schematic flow chart of a dynamic backlight adjustment method according to Embodiment 2 of the present invention.
  • FIG. 4 is a schematic flow chart of a dynamic backlight adjustment method according to Embodiment 3 of the present invention.
  • FIG. 5 is a schematic structural diagram of a dynamic backlight adjustment apparatus according to Embodiment 4 of the present invention.
  • FIG. 6 is a schematic structural diagram of a first evaluation module of a dynamic backlight adjustment apparatus according to Embodiment 4 of the present invention.
  • FIG. 7 is a schematic structural diagram of a dynamic backlight adjusting device according to Embodiment 5 of the present invention.
  • FIG. 8 is a schematic structural diagram of a dynamic backlight adjusting apparatus according to Embodiment 6 of the present invention.
  • FIG. 9 is a schematic structural diagram of a dynamic backlight adjusting apparatus according to Embodiment 7 of the present invention.
  • the dynamic backlight adjustment method includes the following steps:
  • S10 display the display screen state of the device according to the last judgment period, and assign a target backlight value of the display device at the current judgment period;
  • each determination period includes N reading periods, N ⁇ 2;
  • the final backlight value is calculated according to the target backlight value of the current determination period and the target backlight value of the last determination period;
  • the backlight value of the display device can be adjusted by writing a final backlight value to a register of the display device.
  • the display screen state of the display device is displayed according to the last judgment period, and the target backlight value of the display device is assigned at the current determination period.
  • the specific steps are as follows:
  • the target backlight value is assigned to the average value of the brightness of all the display screens read in the previous judgment period.
  • the display screen of the display device of the last judgment period is a static screen
  • the current judgment will be made.
  • the target backlight value of the cycle is assigned to the preset brightness maximum value, which can reduce the influence of the picture pause on the picture quality of the display screen; when the display screen of the last judgment cycle display device is the active picture, the target backlight value of the current judgment period is determined.
  • the value is the average value of the brightness of all the display screens read in the previous judgment period, so that the target backlight value of the current judgment period is smaller than the brightness of all the display screens read in the previous judgment period, and the backlight adjustment process is improved. stability.
  • the display device needs to be started at the beginning of the first judgment period.
  • the target backlight value of the current judging period and the target backlight value of the last judging period are assigned, specifically: the target backlight value of the current judging period and the target backlight value of the last judging period are all assigned to the preset maximum target backlight value.
  • Embodiment 1 in order to make the final backlight value slowly and smoothly approach the target backlight value of the current judgment period from the target backlight value of the last judgment period, after each reading of the display screen brightness, according to the current judgment period The target backlight value and the target backlight value of the last judgment period are calculated.
  • the final backlight value is satisfied: the change amount of the final backlight value calculated each time is the difference between the target backlight value of the current judgment period and the target backlight value of the last judgment period. 1/N of the value.
  • the calculation formula for calculating the final backlight value according to the target backlight value of the current determination period and the target backlight value of the last determination period is specifically:
  • VAL BL [BL last +(BL current -BL last ) ⁇ n/N)] ⁇ Q
  • VAL BL represents the final backlight value
  • BL last represents the target backlight value of the last judgment period
  • BL current represents the target backlight value of the current judgment period
  • n represents the nth read period of the current judgment period is read to the display screen Brightness, 1 ⁇ n ⁇ N
  • Q represents the user adjustment coefficient, 0 ⁇ Q ⁇ 1.
  • Embodiment 3 is a schematic flow chart of a dynamic backlight adjustment method according to Embodiment 2 of the present invention.
  • Embodiment 2 of the present invention is similar to Embodiment 1, and the difference between the two is that, in Embodiment 2, after the brightness of the display screen is read, the target backlight value and the previous judgment period according to the current judgment period are Before the target backlight value is calculated for the final backlight value, the steps are also included:
  • SUM abs represents the absolute difference sum
  • SUM represents the relative difference sum
  • B i and B i-1 respectively represent the current reading time read in the 2nd to Nth read cycles Displays the brightness of the screen and the brightness of the display screen read at the last reading time.
  • a preset error threshold is calculated by the formula (N-1) ⁇ GAP, where the GAP is a preset error threshold.
  • FIG. 4 is a schematic flow chart of a dynamic backlight adjustment method according to Embodiment 3 of the present invention.
  • the method further includes the following steps:
  • the target backlight value is assigned to a preset minimum backlight value if the target backlight value is less than the preset minimum backlight value.
  • the determination period is cyclically executed, and each of the interpretation periods includes N read periods, each of which is t, specifically, every preset read period.
  • t Read the display screen brightness value of the display device once.
  • the target backlight value is assigned according to the display screen state of the display device of the last judgment cycle, and the display screen brightness of the display device is read according to the preset read cycle, after each time the display screen brightness is read.
  • the final backlight value is calculated by using the final backlight value calculation formula, and the final backlight value is written into the display device to adjust the backlight value of the display device.
  • the calculation of the final backlight value is linearly operated according to the target backlight value of the current judgment period and the target backlight value of the last judgment period, so as to adjust the display by gradually increasing or decreasing.
  • the final backlight value of the device E.g:
  • VAL BL [BL last +(BL current -BL last )/N)] ⁇ Q;
  • VAL BL [BL last +k ⁇ (BL current -BL last )/N)] ⁇ Q, k is an integer, and 1 ⁇ k ⁇ N;
  • VAL BL BL current ⁇ Q
  • the amount of change of the final backlight value is adjusted (BL current -BL last )/N each time, and the final backlight value in the current judgment period gradually approaches the current judgment period from the target backlight value of the last judgment period.
  • the target backlight value is such that the adjustment process of the final backlight value of the display device between two adjacent determination periods is stable; meanwhile, since the calculation of the final backlight value is performed after reading the brightness of the display screen each time, the final backlight value is adjusted.
  • the time interval is the preset read period t. Therefore, when the backlight of the display device is adjusted, the adjustment process can be ensured to be slow and stable, thereby preventing the display screen from flickering due to the change of the final backlight value of the display device being too fast.
  • the target backlight value of the current determination period is assigned according to the display screen state of the display device of the last determination period at the beginning of the determination period, the target backlight value is not immediately written to the beginning of the current determination period. Displaying the register of the device, but using a gradual change in the current judgment period to gradually reduce the final backlight value from the target backlight value of the last judgment period to the target backlight value of the current judgment period, thereby avoiding the fluctuation of the input signal to the display device Backlight adjustment process interference.
  • the present invention considers the user experience, and the user can appropriately adjust the final backlight value of the display device according to the content of the display screen. Specifically, the user can adjust the user adjustment coefficient Q through the user menu to adjust the floating range of the final backlight value, and the user adjustment coefficient Q satisfies the relationship:
  • VAL set represents the preset user backlight value
  • VAL user represents the preset user maximum backlight value.
  • the user can preset the VAL set through the user menu on the display device to adjust the user adjustment factor Q, thereby adjusting the floating range of the final backlight value.
  • FIG. 5 is a schematic structural diagram of a dynamic backlight adjustment apparatus according to Embodiment 4 of the present invention.
  • the dynamic backlight adjustment device comprises:
  • the first assignment module 10 is configured to display a display screen state of the device according to the last determination period, and assign a target backlight value to the display device at the current determination period;
  • the reading module 20 is configured to read the brightness of the display screen of the display device according to the preset reading period; wherein each determination period includes N reading periods, N ⁇ 2;
  • the first calculating module 30 is configured to calculate a final backlight value according to the target backlight value of the current determination period and the target backlight value of the last determination period after reading the brightness of the display screen each time;
  • the adjustment module 40 is configured to write the final backlight value calculated each time into a register of the display device to adjust the backlight value of the display device.
  • FIG. 6 is a schematic structural diagram of a first evaluation module in Embodiment 4 of the present invention.
  • the first assignment module 10 specifically includes:
  • the first evaluation unit 101 is configured to: if the display screen of the display device of the last judgment period is a static screen, the target backlight value is assigned a preset maximum brightness value;
  • the second evaluation unit 102 is configured to: if the display screen of the display device of the last determination period is the active screen, the target backlight value is assigned to the average value of the brightness of all the display screens read in the previous determination period.
  • the first assignment module 10 assigns the target backlight value of the current judgment period to a preset value.
  • the maximum brightness value can reduce the influence of the screen pause on the image quality of the display screen; when the display screen of the display device of the last judgment period is the active picture, the target backlight value of the current judgment period is assigned to be read in the previous judgment period.
  • the average value of all the display screen brightnesses can make the target backlight value of the current judgment period change less with respect to the brightness of all the display screens read in the previous judgment period, thereby improving the stability of the backlight adjustment process.
  • the first calculation module 30 in order to make the final backlight value slowly and smoothly approach the target backlight value of the current judgment period from the target backlight value of the last judgment period, the first calculation module 30 satisfies: the final backlight value calculated each time.
  • the amount of change is 1/N of the difference between the target backlight value of the current judgment period and the target backlight value of the last judgment period.
  • the calculation formula for calculating the final backlight value according to the target backlight value of the current determination period and the target backlight value of the last determination period is specifically:
  • VAL BL [BL last +(BL current -BL last ) ⁇ n/N)] ⁇ Q
  • VAL BL represents the final backlight value
  • BL last represents the target backlight value of the last judgment period
  • BL current represents the target backlight value of the current judgment period
  • n represents the nth read period of the current judgment period is read to the display screen Brightness, 1 ⁇ n ⁇ N
  • Q represents the user adjustment coefficient, 0 ⁇ Q ⁇ 1.
  • FIG. 7 is a schematic structural diagram of a dynamic backlight adjustment apparatus according to Embodiment 5 of the present invention.
  • the dynamic backlight adjustment apparatus according to Embodiment 4 of the present invention further includes, in Embodiment 5,
  • the second calculating module 21 is configured to calculate an absolute difference value and calculate the final backlight value according to the target backlight value of the current determination period and the target backlight value of the last determination period after each reading of the brightness of the display screen. And the relative difference sum, the calculation formula is:
  • SUM abs represents the absolute difference sum
  • SUM represents the relative difference sum
  • B i and B i-1 respectively represent the current reading time read in the 2nd to Nth read cycles Display screen brightness, display screen brightness read at the last reading time;
  • the determining module 22 is configured to: at the end of each of the determining periods, display a display screen state of the device according to the corresponding absolute difference value and the relative difference value and determine the corresponding determination period; wherein, if the corresponding absolute difference value is smaller than Or equal to the first preset error threshold and the corresponding relative difference sum is less than or equal to the preset error threshold, determining that the display screen of the display device is a static screen in the corresponding determination period; otherwise, determining that the corresponding determination period is displayed
  • the display screen of the device is the active screen; the first preset error threshold is calculated by the formula (N-1) ⁇ GAP, where the GAP is the preset error threshold.
  • the dynamic backlight adjustment apparatus is further configured to prevent the final backlight of the display device from being too dark, and further includes: a second evaluation module 11 for using the current determination period.
  • a second evaluation module 11 for using the current determination period.
  • the dynamic backlight adjustment apparatus further includes: a preset module 01, configured to display the current current of the display device before the start of the first determination period.
  • the target backlight value of the determination period and the target backlight value of the last determination period are assigned, specifically: the backlight value of the current target determination period and the target backlight value of the previous determination period are all assigned to the preset maximum target backlight value.
  • the determination cycle is performed cyclically, each interpretation cycle includes N read cycles, each read cycle is t, specifically, every predetermined read cycle t Read the display screen brightness value of the display device once.
  • the first assignment module 10 assigns a target backlight value according to the display screen state of the display device of the last determination period, and the reading module 20 reads the display screen brightness of the display device according to the preset read cycle.
  • the first calculation module 20 calculates the final backlight value by using the final backlight value calculation formula after reading the brightness of the display screen, and the adjustment module 40 The final backlight value is then written to the display device to adjust the backlight value of the display device.
  • the calculation of the final backlight value is linearly operated according to the target backlight value of the current judgment period and the target backlight value of the last judgment period, so as to realize the adjustment by gradually increasing or decreasing.
  • Backlight value E.g:
  • VAL BL [BL last +(BL current -BL last )/N)] ⁇ Q;
  • VAL BL [BL last +k ⁇ (BL current -BL last )/N)] ⁇ Q, k is an integer, and 1 ⁇ k ⁇ N;
  • VAL BL BL current ⁇ Q
  • the adjustment module 40 adjusts the amount of change of the final backlight value to (BL current -BL last )/N, and the final backlight value in the current judgment period gradually approaches the current backlight value from the last judgment period. Determining the target backlight value of the cycle, so that the adjustment process of the final backlight value of the display device between two adjacent determination periods is stable; meanwhile, since the calculation of the final backlight value by the first calculation module 30 is performed after reading the brightness of the display screen each time Therefore, the time interval for adjusting the final backlight value is the preset reading period t.
  • the adjustment module 40 performs backlight adjustment on the display device, the adjustment process can be ensured to be slow and stable, thereby preventing the display screen from flickering due to the change of the final backlight value of the display device being too fast.
  • the target backlight value of the current determination period is assigned by the first evaluation module 10 according to the display screen state of the display device of the last determination period at the beginning of the determination period, the target judgment period is not immediately written at the beginning of the current determination period.
  • the user can appropriately adjust the final backlight value of the display device according to the content of the display screen. Specifically, the user can adjust the floating range of the final backlight value by the user adjustment coefficient Q in the final backlight value calculation formula, and the user adjustment coefficient Q satisfies the relationship:
  • VAL set represents the preset user backlight value
  • VAL user represents the preset user maximum backlight value.
  • the user can preset the VAL set through the user menu on the display device to adjust the user adjustment factor Q, thereby adjusting the floating range of the final backlight value.
  • the present invention provides a dynamic backlight adjustment method and a dynamic backlight adjustment device.
  • the target backlight value of the display device is assigned at the current determination period, and then The final backlight value written to the display device register is periodically adjusted according to a linear relationship between the target backlight value of the last determination period and the target backlight value of the current determination period.
  • the final backlight value is gradually increased or decreased from the target backlight value of the last judgment period until the target backlight value of the current judgment period is approached, so that the backlight adjustment process for the display device is slow and stable, thereby effectively preventing the display.
  • the backlight value of the device changes too fast and the display flickers.
  • the target backlight value of the display device is assigned at the beginning of the current judgment period, the target backlight value is not directly written into the register of the display device during the backlight adjustment process, but is gradually changed within the current judgment period.
  • the method makes the final backlight value of the display device gradually approach the target backlight value from the target backlight value of the last determination period, which can effectively prevent the display device from affecting the display of the display screen due to the interference of the input display signal fluctuation during the backlight adjustment process. effect.
  • the dynamic backlight adjustment method of the present invention distinguishes the state of the display screen in the corresponding interpretation period according to the relationship between the corresponding absolute difference sum and the relative difference and the preset error threshold at the end of each determination period.
  • the present invention further considers the user experience, and the user can adjust the floating range of the final backlight value through the user adjustment coefficient Q in the user menu, which can improve user operability and user experience satisfaction.

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Abstract

一种动态背光调节方法以及动态背光调节装置，该方法包括步骤：根据上个判断周期显示设备的显示画面状态，在当前判断周期开始对显示设备的目标背光值进行赋值（S10）；根据预设的读取周期读取显示设备的显示画面亮度（S11）；在每次读取显示画面亮度后计算最终背光值（S12）；根据每次计算得到的最终背光值调节显示设备的背光值（S13）。该装置包括第一赋值模块（10）、读取模块（20）、第一计算模块（30）以及调节模块（40）。该方法和装置能够使背光调节过程缓慢、稳定，还能避免因输入信号的波动而对显示设备背光调节过程造成干扰。

Description

一种动态背光调节方法及装置 技术领域
本发明涉及液晶显示设备领域，尤其涉及一种动态背光调节方法和动态背光调节装置。
背景技术
现有的液晶显示设备多采用动态背光调节技术，以达到节能目的。传统的动态背光调节方法大多是根据显示设备的显示画面亮度与背光值的映射关系来获取显示设备的背光值，再直接向显示设备写入对应的背光值来进行背光调节。该方法存在如下缺点：根据映射关系获取显示设备的背光值，并直接向显示设备写入背光值，导致背光调节过程快速且不稳定，会造成显示画面闪烁，从而导致显示设备输出闪动画面，显示画面的显示效果较差。
发明内容
针对上述问题，本发明的目的在于提供一种动态背光调节方法及装置，能够对显示设备的背光值进行缓慢、稳定的调节，防止显示设备因背光值变化太快而造成显示画面闪烁，同时，还能避免显示设备的背光调节受输入显示信号波动的干扰而影响显示画面的显示效果。
为解决上述技术问题，本发明提供一种动态背光调节方法，包括以下步骤：
根据上个判断周期显示设备的显示画面状态，在当前判断周期开始对显示设备的目标背光值进行赋值；
根据预设的读取周期读取显示设备的显示画面亮度；其中，每一所述判断周期包括N个读取周期，N≥2；
在每次读取所述显示画面亮度后，根据当前判断周期的所述目标背光值与 上个判断周期的目标背光值计算最终背光值；
根据每次计算得到的所述最终背光值调节所述显示设备的背光值。
作为上述方案的改进，所述根据上个判断周期显示设备的显示画面状态，在当前判断周期开始对显示设备的目标背光值进行赋值，具体为：
若上个判断周期显示设备的显示画面为静态画面，所述目标背光值赋值为预设的亮度最大值；
若上个判断周期显示设备的显示画面为活动画面，所述目标背光值赋值为上个判断周期所读取的所有显示画面亮度的平均值。
作为上述方案的改进，所述在每次读取所述显示画面亮度后，根据当前判断周期的所述目标背光值与上个判断周期的目标背光值计算最终背光值满足：
每次计算得到的所述最终背光值的变化量为当前判断周期的所述目标背光值与上个判断周期的目标背光值之间的差值的1/N。
作为上述方案的改进，所述在每次读取所述显示画面亮度后，根据当前判断周期的所述目标背光值与上个判断周期的目标背光值计算最终背光值的计算公式为：
VALBL＝[BLlast+(BLcurrent-BLlast)×n/N)]×Q
其中，VALBL表示最终背光值；BLlast表示上个判断周期的目标背光值；BLcurrent表示当前判断周期的所述目标背光值；n表示在当前判断周期内第n个读取周期读取到所述显示画面亮度，1≤n≤N；Q表示用户调节系数，0＜Q≤1。
作为上述方案的改进，所述在每次读取所述显示画面亮度后，根据当前判断周期的所述目标背光值与上个判断周期的目标背光值计算最终背光值前，还包括步骤：
计算绝对差值和以及相对差值和，计算公式为：
SUMahs＝∑|Bi-Bi-1|，SUM＝∑(Bi-Bi-1)
其中，SUMabs表示绝对差值和，SUM表示相对差值和，2≤i≤N；Bi和Bi-1分别表示第2至第N个读取周期内当前读取时刻所读取的显示画面亮度、上个读取时刻所读取的显示画面亮度。
作为上述方案的改进，还包括步骤：
在每个所述判断周期结束时，根据对应的所述绝对差值和及相对差值和判断对应的所述判断周期显示设备的显示画面状态，其中，若对应的所述绝对差值和小于或等于第一预设误差阈值并且对应的所述相对差值和小于或等于预设误差阈值，则判定为对应的所述判断周期内显示设备的显示画面为静态画面；否则，判定为对应的所述判断周期内显示设备的显示画面为活动画面；所述第一预设误差阈值通过公式(N-1)×GAP计算，其中，GAP为所述预设误差阈值。
作为上述方案的改进，所述根据上个判断周期显示设备的显示画面状态，在当前判断周期开始对显示设备的目标背光值进行赋值后，还包括步骤：
在所述目标背光值小于预设的最小背光值的情况下，将所述目标背光值赋值为所述预设的最小背光值。
作为上述方案的改进，在第一个所述判断周期开始前，对显示设备的当前判断周期的目标背光值和上个判断周期的目标背光值进行赋值，具体为：
将所述当前判断周期的目标背光值和上个判断周期的目标背光值均赋值为预设的最大目标背光值。
本发明还提供一种动态背光调节装置，包括：
第一赋值模块，用于根据上个判断周期显示设备的显示画面状态，在当前判断周期开始对显示设备的目标背光值进行赋值；
读取模块，用于根据预设的读取周期读取显示设备的显示画面亮度；其中，每一所述判断周期包括N个读取周期，N≥2；
第一计算模块，用于在每次读取所述显示画面亮度后，根据当前判断周期 的所述目标背光值与上个判断周期的目标背光值计算最终背光值；
调节模块，用于根据每次计算得到的所述最终背光值调节所述显示设备的背光值。
作为上述方案的改进，所述第一赋值模块具体包括：
第一赋值单元，用于若上个判断周期显示设备的显示画面为静态画面，所述目标背光值赋值为预设的亮度最大值；
第二赋值单元，用于若上个判断周期显示设备的显示画面为活动画面，所述目标背光值赋值为上个判断周期所读取的所有显示画面亮度的平均值。
作为上述方案的改进，所述第一计算模块满足：每次计算得到的所述最终背光值的变化量为当前判断周期的所述目标背光值与上个判断周期的目标背光值之间的差值的1/N。
作为上述方案的改进，所述在每次读取所述显示画面亮度后，根据当前判断周期的所述目标背光值与上个判断周期的目标背光值计算最终背光值的计算公式为：
VALBL＝[BLlast+(BLcurrent-BLlast)×n/N)]×Q
其中，VALBL表示最终背光值；BLlast表示上个判断周期的目标背光值；BLcurrent表示当前判断周期的所述目标背光值；n表示在当前判断周期内第n个读取周期读取到所述显示画面亮度，1≤n≤N；Q表示用户调节系数，0＜Q≤1。
作为上述方案的改进，所述动态背光调节装置还包括：
第二计算模块，用于计算绝对差值和以及相对差值和，计算公式为：
SUMabs＝∑|Bi-Bi-1|，SUM＝∑(Bi-Bi-1)
其中，SUMabs表示绝对差值和，SUM表示相对差值和，2≤i≤N；Bi和Bi-1分别表示第2至第N个读取周期内当前读取时刻所读取的显示画面亮度、上个读取时刻所读取的显示画面亮度；
判断模块，用于在每个所述判断周期结束时，根据对应的所述绝对差值和及相对差值和判断对应的所述判断周期显示设备的显示画面状态，其中，若对应的所述绝对差值和小于或等于第一预设误差阈值并且对应的所述相对差值和小于或等于预设误差阈值，则判定为对应的所述判断周期内显示设备的显示画面为静态画面；否则，判定为对应的所述判断周期内显示设备的显示画面为活动画面；所述第一预设误差阈值通过公式(N-1)×GAP计算，其中，GAP为所述预设误差阈值。
作为上述方案的改进，所述动态背光调节装置还包括：
第二赋值模块，用于在所述当前判断周期的目标背光值小于预设的最小背光值的情况下，将所述当前判断周期的目标背光值赋值为所述预设的最小背光值。
作为上述方案的改进，所述动态背光调节装置还包括：
预设模块，用于在第一个所述判断周期开始前，对显示设备的当前判断周期的目标背光值和上个判断周期的目标背光值进行赋值，具体为：
将所述当前判断周期的目标背光值和上个判断周期的目标背光值均赋值为所述预设的最大目标背光值。
本发明提供的一种动态背光调节方法和动态背光调节装置，根据上个判断周期显示设备的显示画面状态，在当前判断周期开始对显示设备的目标背光值进行赋值，再根据每次读取周期中最终背光值呈线性变化关系，对显示设备的最终背光值进行周期性调节。在调节过程中，最终背光值从上个判断周期的目标背光值逐渐递增或递减直至趋近于当前判断周期的目标背光值，使得对显示设备背光调节过程缓慢、稳定，从而可有效防止因显示设备的背光值变化太快而造成显示画面闪烁。此外，虽然在当前判断周期开始就对显示设备的目标背光值进行赋值，但是在背光调节过程中并没有直接通过该目标背光值来调节显示设备的背光值，而是在当前判断周期内以渐变的方式使显示设备的最终背光 值从上个判断周期的目标背光值逐渐趋近于该目标背光值，能够有效避免显示设备在背光调节过程中因受输入显示信号波动的干扰而影响显示画面的显示效果。
附图说明
图1是本发明实施例1的一种动态背光调节方法的流程示意图。
图2是本发明实施例1中根据上个判断周期显示设备的显示画面状态，在当前判断周期开始对显示设备的目标背光值进行赋值的细化流程示意图。
图3是本发明实施例2的一种动态背光调节方法的流程示意图。
图4是本发明实施例3的一种动态背光调节方法的流程示意图。
图5是本发明实施例4的一种动态背光调节装置的结构示意图。
图6是本发明实施例4中动态背光调节装置的第一赋值模块的结构示意图。
图7是本发明实施例5的一种动态背光调节装置的结构示意图。
图8是本发明实施例6的一种动态背光调节装置的结构示意图。
图9是本发明实施例7的一种动态背光调节装置的结构示意图。
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
参见图1，是本发明实施例1的一种动态背光调节方法的流程示意图，该动态背光调节方法，包括以下步骤：
S10：根据上个判断周期显示设备的显示画面状态，在当前判断周期开始对显示设备的目标背光值进行赋值；
S11：根据预设的读取周期读取显示设备的显示画面亮度；其中，每一判断周期包括N个读取周期，N≥2；
S12：在每次读取显示画面亮度后，根据当前判断周期的目标背光值与上个判断周期的目标背光值计算最终背光值；
S13：根据每次计算得到的最终背光值调节显示设备的背光值。
在具体实施过程中，可以通过向显示设备的寄存器写入最终背光值的方式来对显示设备的背光值进行调节。
参见图2，在本发明实施例1中，根据上个判断周期显示设备的显示画面状态，在当前判断周期开始对显示设备的目标背光值进行赋值，具体步骤为：
S101：若上个判断周期显示设备的显示画面为静态画面，目标背光值赋值为预设的亮度最大值；
S102：若上个判断周期显示设备的显示画面为活动画面，目标背光值赋值为上个判断周期所读取的所有显示画面亮度的平均值。
在上述赋值过程中，当上个判断周期显示设备的显示画面为静态画面时，可能存在画面暂停的情况，为满足用户体验，当上个判断周期显示设备的显示画面为静态画面，将当前判断周期的目标背光值赋值为预设的亮度最大值，可以减小画面暂停对显示画面画质的影响；当上个判断周期显示设备的显示画面为活动画面时，将当前判断周期的目标背光值赋值为上个判断周期所读取的所有显示画面亮度的平均值，可使当前判断周期的目标背光值相对于上个判断周期所读取的所有显示画面亮度变化较小，提高背光调节过程的稳定性。
可以理解的，为保证动态背光调节过程的顺利进行，若当前判断周期为第一个判断周期时(即不存在上个判断周期的情况下)，在第一个判断周期开始需要对显示设备的当前判断周期的目标背光值和上个判断周期的目标背光值进行赋值，具体为：将当前判断周期的目标背光值和上个判断周期的目标背光值均赋值为预设的最大目标背光值。
在实施例1中，为使最终背光值从上个判断周期的目标背光值缓慢、平稳的趋近于当前判断周期的目标背光值，在每次读取显示画面亮度后，根据当前判断周期的目标背光值与上个判断周期的目标背光值计算最终背光值满足：每次计算得到的最终背光值的变化量为当前判断周期的目标背光值与上个判断周期的目标背光值之间的差值的1/N。
优选地，在每次读取显示画面亮度后，根据当前判断周期的目标背光值与上个判断周期的目标背光值计算最终背光值的计算公式具体为：
VALBL＝[BLlast+(BLcurrent-BLlast)×n/N)]×Q
其中，VALBL表示最终背光值；BLlast表示上个判断周期的目标背光值；BLcurrent表示当前判断周期的目标背光值；n表示在当前判断周期内第n个读取周期读取到显示画面亮度，1≤n≤N；Q表示用户调节系数，0＜Q≤1。
参见图3，是本发明实施例2的一种动态背光调节方法的流程示意图。本发明实施例2与实施例1相似，二者的不同之处为，在实施例2中，在每次读取显示画面亮度后，根据当前判断周期的所述目标背光值与上个判断周期的目标背光值计算最终背光值前，还包括步骤：
S22：计算绝对差值和以及相对差值和，计算公式为：
SUMabs＝∑|Bi-Bi-1|，SUM＝∑(Bi-Bi-1)
其中，SUMabs表示绝对差值和，SUM表示相对差值和，2≤i≤N；Bi和Bi-1分别表示第2至第N个读取周期内当前读取时刻所读取的显示画面亮度、上个读取时刻所读取的显示画面亮度。
S25：在每个判断周期结束时，根据对应的绝对差值和及相对差值和判断对应的判断周期显示设备的显示画面状态，其具体步骤为：
若对应的绝对差值小于或等于第一预设误差阈值并且对应的相对差值和小于或等于预设误差阈值，则判定为对应的判断周期内显示设备的显示画面为静态画面；否则，判定为对应的判断周期内显示设备的显示画面为活动画面；第 一预设误差阈值通过公式(N-1)×GAP计算，其中，GAP为预设误差阈值。
参见图4，是本发明实施例3的一种动态背光调节方法的流程示意图。基于本发明动态背光调节方法实施例1，在实施例3中，为防止显示设备的最终背光过暗，在每个判断周期开始对显示设备的目标背光值进行赋值后，还包括步骤：
S31：在目标背光值小于预设的最小背光值的情况下，将目标背光值赋值为预设的最小背光值。
参见图1、3～4，在上述实施例中，判断周期循环执行，每一判读周期包括N个读取周期，每个读取周期为t，具体地，可以每隔预设的读取周期t读取一次显示设备的显示画面亮度值。在当前判断周期开始时，根据上个判断周期显示设备的显示画面状态对目标背光值进行赋值，根据预设的读取周期读取显示设备的显示画面亮度，在每次读取显示画面亮度后，利用最终背光值计算公式计算得到最终背光值，再将最终背光值写入显示设备来调节显示设备的背光值。
为了防止显示设备的最终背光值变化太快，最终背光值的计算根据当前判断周期的目标背光值和上个判断周期的目标背光值进行线性运算，以实现通过逐渐递增或递减的方式来调节显示设备的最终背光值。例如：
当n＝1时，VALBL＝[BLlast+(BLcurrent-BLlast)/N)]×Q；
当n＝k时，VALBL＝[BLlast+k×(BLcurrent-BLlast)/N)]×Q，k为整数，且1＜k＜N；
当n＝N时，VALBL＝BLcurrent×Q；
在调节过程中，每次调节最终背光值的变化量为(BLcurrent-BLlast)/N，当前判断周期内的最终背光值从上个判断周期的目标背光值逐渐趋近于当前判断周期的目标背光值，使得两个相邻判断周期间显示设备最终背光值的调节过程稳定；同时，由于对最终背光值的计算是在每次读取显示画面亮度后执行，所以对最终背光值进行调节的时间间隔为预设的读取周期t。因此，当对显示设备进行背光调节时，可以确保调节过程的缓慢、稳定，进而避免因显示设备的最终背光 值变化太快而造成显示画面闪烁。另外，因为当前判断周期的目标背光值在该判断周期开始时根据上个判断周期显示设备的显示画面状态对其进行赋值所得，但是在当前判断周期开始时并没有立即写入该目标背光值到显示设备的寄存器，而是在当前判断周期内采用渐变的方式使最终背光值从上个判断周期的目标背光值逐渐趋于当前判断周期的目标背光值，从而可避免输入信号的波动对显示设备背光调节过程的干扰。
此外，本发明考虑了用户体验，用户可以根据显示画面的内容对显示设备的最终背光值进行适当调整。具体地，用户可以通过用户菜单调节用户调节系数Q来调整最终背光值的浮动范围，且用户调节系数Q满足关系：
Q＝VALset/VALuser
其中，VALset表示预设的用户背光值，VALuser表示预设的用户最大背光值。用户可通过显示设备上的用户菜单对VALset进行预设，以调节用户调节系数Q，进而调节最终背光值的浮动范围。
参见图5，是本发明实施例4的一种动态背光调节装置的结构示意图。该动态背光调节装置，包括：
第一赋值模块10，用于根据上个判断周期显示设备的显示画面状态，在当前判断周期开始对显示设备的目标背光值进行赋值；
读取模块20，用于根据预设的读取周期读取显示设备的显示画面亮度；其中，每一判断周期包括N个读取周期，N≥2；
第一计算模块30，用于在每次读取显示画面亮度后，根据当前判断周期的目标背光值与上个判断周期的目标背光值计算最终背光值；
调节模块40，用于将每次计算得到的最终背光值写入显示设备的寄存器，以调节显示设备的背光值。
参见图6，是本发明实施例4中第一赋值模块的结构示意图。第一赋值模块10，具体包括：
第一赋值单元101，用于若上个判断周期显示设备的显示画面为静态画面，目标背光值赋值为预设的亮度最大值；
第二赋值单元102，用于若上个判断周期显示设备的显示画面为活动画面，目标背光值赋值为上个判断周期所读取的所有显示画面亮度的平均值。
在上述赋值过程中，当上个判断周期显示设备的显示画面为静态画面时，可能存在画面暂停的情况，为满足用户体验，第一赋值模块10将当前判断周期的目标背光值赋值为预设的亮度最大值，可以减小画面暂停对显示画面画质的影响；当上个判断周期显示设备的显示画面为活动画面时，将当前判断周期的目标背光值赋值为上个判断周期所读取的所有显示画面亮度的平均值，可使当前判断周期的目标背光值相对于上个判断周期所读取的所有显示画面亮度变化较小，提高背光调节过程的稳定性。
在本实施例中，为使最终背光值从上个判断周期的目标背光值缓慢、平稳的趋近于当前判断周期的目标背光值，第一计算模块30满足：每次计算得到的最终背光值的变化量为当前判断周期的目标背光值与上个判断周期的目标背光值之间的差值的1/N。
优选地，在每次读取显示画面亮度后，根据当前判断周期的目标背光值与上个判断周期的目标背光值计算最终背光值的计算公式具体为：
VALBL＝[BLlast+(BLcurrent-BLlast)×n/N)]×Q
其中，VALBL表示最终背光值；BLlast表示上个判断周期的目标背光值；BLcurrent表示当前判断周期的目标背光值；n表示在当前判断周期内第n个读取周期读取到显示画面亮度，1≤n≤N；Q表示用户调节系数，0＜Q≤1。
参见图7，是本发明实施例5的一种动态背光调节装置的结构示意图。基于本发明实施例4中的动态背光调节装置，在实施例5中，还包括：
第二计算模块21，用于在每次读取显示画面亮度后，根据当前判断周期的目标背光值与上个判断周期的目标背光值计算最终背光值前计算绝对差值和以 及相对差值和，计算公式为：
SUMabs＝∑|Bi-Bi-1|，SUM＝∑(Bi-Bi-1)
其中，SUMabs表示绝对差值和，SUM表示相对差值和，2≤i≤N；Bi和Bi-1分别表示第2至第N个读取周期内当前读取时刻所读取的显示画面亮度、上个读取时刻所读取的显示画面亮度；
判断模块22，用于在每个所述判断周期结束时，根据对应的绝对差值和及相对差值和判断对应的判断周期显示设备的显示画面状态；其中，若对应的绝对差值和小于或等于第一预设误差阈值并且对应的相对差值和小于或等于预设误差阈值，则判定为对应的判断周期内显示设备的显示画面为静态画面；否则，判定为对应的判断周期内显示设备的显示画面为活动画面；第一预设误差阈值通过公式(N-1)×GAP计算，其中，GAP为预设误差阈值。
参见图8，同样基于本发明实施例6中的动态背光调节装置，在本实施例中，为防止显示设备的最终背光过暗，还包括：第二赋值模块11，用于在当前判断周期的目标背光值小于预设的最小背光值的情况下，将当前判断周期的目标背光值赋值为预设的最小背光值。
参见图9，为保证动态背光调节过程的顺利进行，基于本发明实施例7的动态背光调节装置，还包括：预设模块01，用于在第一个判断周期开始前，对显示设备的当前判断周期的目标背光值和上个判断周期的目标背光值进行赋值，具体为：将当前目标判断周期的背光值和上个判断周期的目标背光值均赋值为预设的最大目标背光值。
参见图5、7～9，在上述实施例中，判断周期循环执行，每一判读周期包括N个读取周期，每个读取周期为t，具体地，可以每隔预设的读取周期t读取一次显示设备的显示画面亮度值。在当前判断周期开始时，第一赋值模块10根据上个判断周期显示设备的显示画面状态对目标背光值进行赋值，读取模块20根据预设的读取周期读取显示设备的显示画面亮度，第一计算模块20在每次读取显示画面亮度后，利用最终背光值计算公式计算得到最终背光值，调节模块40 再将最终背光值写入显示设备来调节显示设备的背光值。
为了防止显示设备的最终背光值变化太快，最终背光值的计算根据当前判断周期的目标背光值和上个判断周期的目标背光值进行线性运算，以实现通过逐渐递增或递减的方式来调节最终背光值。例如：
当n＝1时，VALBL＝[BLlast+(BLcurrent-BLlast)/N)]×Q；
当n＝k时，VALBL＝[BLlast+k×(BLcurrent-BLlast)/N)]×Q，k为整数，且1＜k＜N；
当n＝N时，VALBL＝BLcurrent×Q；
在调节过程中，调节模块40每次调节最终背光值的变化量为(BLcurrent-BLlast)/N，当前判断周期内的最终背光值从上个判断周期的目标背光值逐渐趋近于当前判断周期的目标背光值，使得两个相邻判断周期间显示设备最终背光值的调节过程稳定；同时，由于第一计算模块30对最终背光值的计算是在每次读取显示画面亮度后执行，所以对最终背光值进行调节的时间间隔为预设的读取周期t。因此，当调节模块40对显示设备进行背光调节时，可以确保调节过程的缓慢、稳定，进而避免因显示设备的最终背光值变化太快而造成显示画面闪烁。另外，因为当前判断周期的目标背光值在该判断周期开始时由第一赋值模块10根据上个判断周期显示设备的显示画面状态对其进行赋值所得，但是在当前判断周期开始时并没有立即写入该目标背光值到显示设备的寄存器，而是在当前判断周期内采用渐变的方式使最终背光值从上个判断周期的目标背光值逐渐趋于当前判断周期的目标背光值，从而可避免输入信号的波动对显示设备背光调节过程的干扰。
此外，考虑用户体验，用户可以根据显示画面的内容对显示设备的最终背光值进行适当调整。具体地，用户可以通过最终背光值计算公式中的用户调节系数Q来调节最终背光值的浮动范围，用户调节系数Q满足关系：
Q＝VALset/VALuser
其中，VALset表示预设的用户背光值，VALuser表示预设的用户最大背光值。用户可通过显示设备上的用户菜单对VALset进行预设，以调节用户调节系数Q，进而调节最终背光值的浮动范围。
综上所述，本发明提供的一种动态背光调节方法和动态背光调节装置，先根据上个判断周期显示设备的显示画面状态，在当前判断周期开始对显示设备的目标背光值进行赋值，再根据上个判断周期的目标背光值与当前判断周期的目标背光值之间的线性关系，对写入显示设备寄存器的最终背光值进行周期性调节。在调节过程中，最终背光值从上个判断周期的目标背光值逐渐递增或递减直至趋近于当前判断周期的目标背光值，使得对显示设备背光调节过程缓慢、稳定，从而可有效防止因显示设备的背光值变化太快而造成显示画面闪烁。此外，虽然在当前判断周期开始就对显示设备的目标背光值进行赋值，但是在背光调节过程中并没有直接将该目标背光值写入显示设备的寄存器，而是在当前判断周期内以渐变的方式使显示设备的最终背光值从上个判断周期的目标背光值逐渐趋近于该目标背光值，能够有效避免显示设备在背光调节过程中因受输入显示信号波动的干扰而影响显示画面的显示效果。再者，本发明的动态背光调节方法在每个判断周期结束时，根据对应的绝对差值和以及相对差值和与预设误差阈值之间的关系来区分对应判读周期内显示画面的状态，当对应判断周期的所有显示画面亮度在误差阈值范围内波动时，仍然判定该判断周期的显示画面为静态画面，这样就不会因为输入信号的波动而造成最终背光值产生大幅度变化。本发明还进一步考虑到用户体验，用户可通过用户菜单中的用户调节系数Q来调节最终背光值的浮动范围，能够提高用户的可操作性和用户体验满意度。
以上所述是本发明的优选实施方式，应当指出，对于本技术领域的普通技术人员来说，在不脱离本发明原理的前提下，还可以做出若干改进和润饰，这些改进和润饰也视为本发明的保护范围。

Claims (10)

  1. 一种动态背光调节方法，其特征在于，包括以下步骤：
    根据上个判断周期显示设备的显示画面状态，在当前判断周期开始对显示设备的目标背光值进行赋值；
    根据预设的读取周期读取显示设备的显示画面亮度；其中，每一所述判断周期包括N个读取周期，N≥2；
    在每次读取所述显示画面亮度后，根据当前判断周期的所述目标背光值与上个判断周期的目标背光值计算最终背光值；
    根据每次计算得到的所述最终背光值调节所述显示设备的背光值。
  2. 如权利要求1所述的动态背光调节方法，其特征在于，所述根据上个判断周期显示设备的显示画面状态，在当前判断周期开始对显示设备的目标背光值进行赋值，具体为：
    若上个判断周期显示设备的显示画面为静态画面，所述目标背光值赋值为预设的亮度最大值；
    若上个判断周期显示设备的显示画面为活动画面，所述目标背光值赋值为上个判断周期所读取的所有显示画面亮度的平均值。
  3. 如权利要求1所述的动态背光调节方法，其特征在于，所述在每次读取所述显示画面亮度后，根据当前判断周期的所述目标背光值与上个判断周期的目标背光值计算最终背光值满足：
    每次计算得到的所述最终背光值的变化量为当前判断周期的所述目标背光值与上个判断周期的目标背光值之间的差值的1/N。
  4. 如权利要求1所述的动态背光调节方法，其特征在于，所述在每次读取所述显示画面亮度后，根据当前判断周期的所述目标背光值与上个判断周期的目标背光值计算最终背光值的计算公式为：
    VALBL＝[BLlast+(BLcurrent-BLlast)×n/N)]×Q
    其中，VALBL表示最终背光值；BLlast表示上个判断周期的目标背光值；BLcurrent表示当前判断周期的所述目标背光值；n表示在当前判断周期内第n个读取周期读取到所述显示画面亮度，1≤n≤N；Q表示用户调节系数，0＜Q≤1。
  5. 如权利要求1所述的动态背光调节方法，其特征在于，所述在每次读取所述显示画面亮度后，根据当前判断周期的所述目标背光值与上个判断周期的目标背光值计算最终背光值前，还包括步骤：
    计算绝对差值和以及相对差值和，计算公式为：
    SUMabs＝∑|Bi-Bi-1|，SUM＝∑(Bi-Bi-1)
    其中，SUMabs表示绝对差值和，SUM表示相对差值和，2≤i≤N；Bi和Bi-1分别表示第2至第N个读取周期内当前读取时刻所读取的显示画面亮度、上个读取时刻所读取的显示画面亮度。
  6. 如权利要求5所述的动态背光调节方法，其特征在于，还包括步骤：
    在每个所述判断周期结束时，根据对应的所述绝对差值和及相对差值和判断对应的所述判断周期显示设备的显示画面状态，其中，若对应的所述绝对差值和小于或等于第一预设误差阈值并且对应的所述相对差值和小于或等于预设误差阈值，则判定为对应的所述判断周期内显示设备的显示画面为静态画面；否则，判定为对应的所述判断周期内显示设备的显示画面为活动画面；所述第一预设误差阈值通过公式(N-1)×GAP计算，其中，GAP为所述预设误差阈值。
  7. 如权利要求1所述的动态背光调节方法，其特征在于，所述根据上个判断周期显示设备的显示画面状态，在当前判断周期开始对显示设备的目标背光值进行赋值后，还包括步骤：
    在所述目标背光值小于预设的最小背光值的情况下，将所述目标背光值赋值为所述预设的最小背光值。
  8. 如权利要求1所述的动态背光调节方法，其特征在于，在第一个所述判断周期开始前，对显示设备的当前判断周期的目标背光值和上个判断周期的目标背光值进行赋值，具体为：
    将所述当前判断周期的目标背光值和上个判断周期的目标背光值均赋值为预设的最大目标背光值。
  9. 一种动态背光调节装置，其特征在于，包括：
    第一赋值模块，用于根据上个判断周期显示设备的显示画面状态，在当前判断周期开始对显示设备的目标背光值进行赋值；
    读取模块，用于根据预设的读取周期读取显示设备的显示画面亮度；其中，每一所述判断周期包括N个读取周期，N≥2；
    第一计算模块，用于在每次读取所述显示画面亮度后，根据当前判断周期的所述目标背光值与上个判断周期的目标背光值计算最终背光值；
    调节模块，用于根据每次计算得到的所述最终背光值调节所述显示设备的背光值。
  10. 如权利要求9所述的动态背光调节装置，其特征在于，所述第一计算 模块满足：
    每次计算得到的所述最终背光值的变化量为当前判断周期的所述目标背光值与上个判断周期的目标背光值之间的差值的1/N。
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